Honeywell T4M Installation guide

Brand: Honeywell

Model: T4M

Type: Installation guide

Honeywell T4M is a programmable modulating thermostat compatible with OpenTherm appliances, allowing you to control your heating system efficiently. It features a user-friendly interface with a large backlit display, making it easy to adjust temperature settings and view system status. With its advanced menu, you can customize various parameters such as cycle rate, temperature limits, schedule options, and daylight saving time settings. The T4M also includes a wired remote sensor option for accurate temperature readings in specific areas of your home.

32318058001 D

1 Wire the

Thermostat 2 Power Up

and Test 3 Configure

the System

T4M Thermostat

Programmable Modulating Thermostat

Quick Start Installation Guide

Compatible with OpenTherm appliances only.

Not compatible with 230V boilers, zone valve

applications or 230V electric heating.

Installation in 3 steps...

Must be installed by a competent person.

To ensure your safety make sure the mains power

is switched OFF before accessing wiring.

Find a suitable wall location away from draughts,

direct sunlight or other heat sources, and where cables

can be run from the boiler to the thermostat.

B) Connect wires according

to wiring diagrams and

clip the cover closed.

Wire the Thermostat

1.2-1.5m

OpenTherm Boiler

OpenTherm

Boiler

Thermostat

OT OT

To prevent a short circuit from a loose wire -

• When using multi-core cables: Only remove enough outer

insulation to allow secure fixing of the cores into the terminal block.

• When using single core cables: Secure them together with

a cable tie as close as possible to the terminal block.

Polarity

free

Press the button to increase

the temperature to maximum and

check the boiler switches on

– The heat demand icon on the

thermostat should be on.

Now press the button to decrease

the temperature to minimum and

check the boiler switches off

– The heat demand icon on the

thermostat should also go off.

Power Up the Heating System and do a quick functional test

on the thermostat to check that it switches the boiler.

Power Up and Test

A) Separate the wallplate from

the thermostat, and using a

screwdriver open the wallplate

terminal cover to connect wires.

min 0.25mm²

max 1.5mm²

max 6mm

OpenTherm

Communication

Parameters

NoDescription Settings (default in bold)

1:LA Language 1 = EN, 2 = NL, 3 = FR

2:CR Cycle Rate 6

4:LL Lower Temperature Limit 5 - 21 (°C)

5:UL Upper Temperature Limit 21 - 35 (°C)

6:SO Schedule options 1 = 7 day

(different schedule each day of the week)

2 = 5 + 2 day (weekday + weekend schedule)

3 = 1 day (same schedule every day)

7:NP Number of periods per day 4 or 6

8:SS Wired Remote Sensor 0 = No Remote Sensor, 1 = Wired Remote Sensor

9:LC Fail Safe mode 0 = Boiler off, 1 = Boiler 20% on / 80% off

10:BL Backlight 0 = Off, 1 = On (only on demand)

11:CL Clock Format 0 = 24 hr, 1 = AM/PM

12:DS Daylight Saving time change 0 = Off, 1 = Auto

13:TO Temperature Display Offset +/1.5°C

15:SD Restore Schedule Defaults 0, 1 = reset

16:FS Restore Factory Settings 0, 1 = reset

17 OP Optimisation 0=Disabled, 1=Enabled

Configure the System

Specific settings for the thermostat

and heating system can be

configured in the advanced menu.

Press and hold and then

buttons together until the display

changes (approx. 3 seconds).

A) Press and buttons to navigate

through the parameter list.

B) Press and buttons to

change a parameter.

C) Press button to save the change

(or press to cancel the change).

D) Press button to exit advanced

menu and save any changes.

Parameter

Number

Parameter

Setting

OpenTherm Data ID's

NoDescription Settings (default in bold)

O T1 Low load control 0 = Off, 1 = On

OT2 Control setpoint 5 - 99°C

OT3 Supply water temperature 5 - 99°C

OT4 Return water temperature 5 - 99°C

OT5 Max. supply water temperature 5 - 99°C

OT6 Hot water temperature 5 - 99°C

OT7 Hot water setpoint 5 - 99°C

OT8 Actual power 0 - 99%

OT9 Water pressure 0.0 - 9.9

O T1 0 OTC control 0 = Off, 1 = On

O T11 OTC curve 4 - 40 (16)

O T1 2 Room compensation 0 = Off, 1 = On

Conforms to protection requirements of the following directives:

EMC: 2014/30/EU and LVD: 2014/35/EU

The full text of the EU declaration of conformity is available at the

following internet address: https://hwllhome.co/DoC

ErP: Class V (+3%), (EU) 811/2013

WEEE Directive 2012/19/EU - Waste Electrical and Electronic Equipment directive

At the end of the product life dispose of the packaging and product in a corresponding recycling

centre. Do not dispose of the unit with the usual domestic refuse. Do not burn the product.

Troubleshooting

What’s happening? What it could mean... How to fix it...

Thermostat

display is blank

No power to

heating system

Check heating system is powered

Faulty wiring connection Check wiring at thermostat

and boiler terminals

Display = Faulty temperature

sensor

Replace thermostat or check wiring to

remote temperature sensor if fitted

Thermostat shows

heat demand

but boiler doesn't

respond

Boiler (water) already

at temperature

Normal behaviour - wait for

water temperature to drop

Faulty wiring connection Check wiring at thermostat

and boiler terminals

An OpenTherm boiler can report alerts back to the Thermostat.

You can view these in the ‘OpenTherm® boiler alerts’ menu.

The OpenTherm Data ID’s appear after the installer parameters (see the table above).

The Honeywell Home trademark is used under license from Honeywell International Inc.

This product is manufactured by Resideo Technologies, Inc. and its affiliates.

Pittway Sarl, Z.A. La Pièce 4,

1180 Rolle, Switzerland

Country of origin : UK

Honeywell T4M Installation guide

Honeywell T4M Installation guide

Honeywell T4M Installation guide

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